Question A6The Tully-Fischer method relies on being able to relate the mass of a galaxy to its rotation velocity.Stars in the outer-most regions of the Milky Way galaxy, located at a distance of 50 kpc from thegalactic centre, are observed to orbit at a speed Vrot = 250 km s-¹. Using Kepler's 3rd Law,determine the mass in the Milky Way that lies interior to 50 kpc. Express your answer in units ofthe Solar mass.

Given: Distance of galactic center of Milky way is r=50kpc3.086×1019m1kpc=154.3×1019m. Velocity of…

Answered: The Tully-Fischer method relies on…

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